diff options
Diffstat (limited to 'libxcb/src/xcb_auth.c')
| -rw-r--r-- | libxcb/src/xcb_auth.c | 76 |
1 files changed, 58 insertions, 18 deletions
diff --git a/libxcb/src/xcb_auth.c b/libxcb/src/xcb_auth.c index ab8480372..c0ad90267 100644 --- a/libxcb/src/xcb_auth.c +++ b/libxcb/src/xcb_auth.c @@ -60,11 +60,21 @@ enum auth_protos { N_AUTH_PROTOS }; +#define AUTH_PROTO_XDM_AUTHORIZATION "XDM-AUTHORIZATION-1" +#define AUTH_PROTO_MIT_MAGIC_COOKIE "MIT-MAGIC-COOKIE-1" + static char *authnames[N_AUTH_PROTOS] = { #ifdef HASXDMAUTH - "XDM-AUTHORIZATION-1", + AUTH_PROTO_XDM_AUTHORIZATION, +#endif + AUTH_PROTO_MIT_MAGIC_COOKIE, +}; + +static int authnameslen[N_AUTH_PROTOS] = { +#ifdef HASXDMAUTH + sizeof(AUTH_PROTO_XDM_AUTHORIZATION) - 1, #endif - "MIT-MAGIC-COOKIE-1", + sizeof(AUTH_PROTO_MIT_MAGIC_COOKIE) - 1, }; static size_t memdup(char **dst, void *src, size_t len) @@ -79,9 +89,9 @@ static size_t memdup(char **dst, void *src, size_t len) return len; } -static int authname_match(enum auth_protos kind, char *name, int namelen) +static int authname_match(enum auth_protos kind, char *name, size_t namelen) { - if(strlen(authnames[kind]) != namelen) + if(authnameslen[kind] != namelen) return 0; if(memcmp(authnames[kind], name, namelen)) return 0; @@ -98,12 +108,12 @@ static Xauth *get_authptr(struct sockaddr *sockname, unsigned int socknamelen, unsigned short family; char hostnamebuf[256]; /* big enough for max hostname */ char dispbuf[40]; /* big enough to hold more than 2^64 base 10 */ - int authnamelens[N_AUTH_PROTOS]; - int i; + int dispbuflen; family = FamilyLocal; /* 256 */ switch(sockname->sa_family) { +#ifdef AF_INET6 case AF_INET6: addr = (char *) SIN6_ADDR(sockname); addrlen = sizeof(*SIN6_ADDR(sockname)); @@ -115,6 +125,7 @@ static Xauth *get_authptr(struct sockaddr *sockname, unsigned int socknamelen, } addr += 12; /* if v4-mapped, fall through. */ +#endif case AF_INET: if(!addr) addr = (char *) &((struct sockaddr_in *)sockname)->sin_addr; @@ -128,7 +139,11 @@ static Xauth *get_authptr(struct sockaddr *sockname, unsigned int socknamelen, return 0; /* cannot authenticate this family */ } - snprintf(dispbuf, sizeof(dispbuf), "%d", display); + dispbuflen = snprintf(dispbuf, sizeof(dispbuf), "%d", display); + if(dispbuflen < 0) + return 0; + /* snprintf may have truncate our text */ + dispbuflen = MIN(dispbuflen, sizeof(dispbuf) - 1); if (family == FamilyLocal) { if (gethostname(hostnamebuf, sizeof(hostnamebuf)) == -1) @@ -137,12 +152,10 @@ static Xauth *get_authptr(struct sockaddr *sockname, unsigned int socknamelen, addrlen = strlen(addr); } - for (i = 0; i < N_AUTH_PROTOS; i++) - authnamelens[i] = strlen(authnames[i]); return XauGetBestAuthByAddr (family, (unsigned short) addrlen, addr, - (unsigned short) strlen(dispbuf), dispbuf, - N_AUTH_PROTOS, authnames, authnamelens); + (unsigned short) dispbuflen, dispbuf, + N_AUTH_PROTOS, authnames, authnameslen); } #ifdef HASXDMAUTH @@ -190,12 +203,13 @@ static int compute_auth(xcb_auth_info_t *info, Xauth *authptr, struct sockaddr * APPEND(info->data, j, si->sin_port); } break; +#ifdef AF_INET6 case AF_INET6: /*block*/ { struct sockaddr_in6 *si6 = (struct sockaddr_in6 *) sockname; if(IN6_IS_ADDR_V4MAPPED(SIN6_ADDR(sockname))) { - APPEND(info->data, j, si6->sin6_addr.s6_addr[12]); + do_append(info->data, &j, &si6->sin6_addr.s6_addr[12], 4); APPEND(info->data, j, si6->sin6_port); } else @@ -210,6 +224,7 @@ static int compute_auth(xcb_auth_info_t *info, Xauth *authptr, struct sockaddr * } } break; +#endif case AF_UNIX: /*block*/ { uint32_t fakeaddr = htonl(0xffffffff - next_nonce()); @@ -246,25 +261,50 @@ int _xcb_get_auth_info(int fd, xcb_auth_info_t *info, int display) char sockbuf[sizeof(struct sockaddr) + MAXPATHLEN]; unsigned int socknamelen = sizeof(sockbuf); /* need extra space */ struct sockaddr *sockname = (struct sockaddr *) &sockbuf; + int gotsockname = 0; Xauth *authptr = 0; int ret = 1; + /* Some systems like hpux or Hurd do not expose peer names + * for UNIX Domain Sockets, but this is irrelevant, + * since compute_auth() ignores the peer name in this + * case anyway.*/ if (getpeername(fd, sockname, &socknamelen) == -1) - return 0; /* can only authenticate sockets */ + { + if (sockname->sa_family != AF_UNIX) + return 0; /* except for AF_UNIX, sockets should have peernames */ + if (getsockname(fd, sockname, &socknamelen) == -1) + return 0; /* can only authenticate sockets */ + gotsockname = 1; + } authptr = get_authptr(sockname, socknamelen, display); if (authptr == 0) return 0; /* cannot find good auth data */ info->namelen = memdup(&info->name, authptr->name, authptr->name_length); - if(info->namelen) - ret = compute_auth(info, authptr, sockname); + if (!info->namelen) + goto no_auth; /* out of memory */ + + if (!gotsockname && getsockname(fd, sockname, &socknamelen) == -1) + { + free(info->name); + goto no_auth; /* can only authenticate sockets */ + } + + ret = compute_auth(info, authptr, sockname); if(!ret) { - free(info->name); - info->name = 0; - info->namelen = 0; + free(info->name); + goto no_auth; /* cannot build auth record */ } + XauDisposeAuth(authptr); return ret; + + no_auth: + info->name = 0; + info->namelen = 0; + XauDisposeAuth(authptr); + return 0; } |